i think the 88-89 were 8 valves(d15b1), and the 90-91 were 16 valves(d15b2)... the mpfi swap is one of the best things you can do to your car. its one mod that is helping you now and will help you and work in conjunction to other mods/swaps down the road from now. we did one on my buddys crx it made a huge diffrence. it ran a 18.5 or something like that and after the swap it ran a 16.5 so you figure 2 seconds is deffinitly worth the swap